Object proceed() throws Throwable //執(zhí)行目標(biāo)方法
Object proceed(Object[] var1) throws Throwable //傳入的新的參數(shù)去執(zhí)行目標(biāo)方法

@Aspect
@Component
public class aopAspect {
    /**
     * 定義一個(gè)切入點(diǎn)表達(dá)式,用來確定哪些類需要代理
     * execution(* aopdemo.*.*(..))代表aopdemo包下所有類的所有方法都會(huì)被代理
     */
    @Pointcut("execution(* aopdemo.*.*(..))")
    public void declareJoinPointerExpression() {}
    /**
     * 前置方法,在目標(biāo)方法執(zhí)行前執(zhí)行
     * @param joinPoint 封裝了代理方法信息的對(duì)象,若用不到則可以忽略不寫
     */
    @Before("declareJoinPointerExpression()")
    public void beforeMethod(JoinPoint joinPoint){
        System.out.println("目標(biāo)方法名為:" + joinPoint.getSignature().getName());
        System.out.println("目標(biāo)方法所屬類的簡單類名:" +        joinPoint.getSignature().getDeclaringType().getSimpleName());
        System.out.println("目標(biāo)方法所屬類的類名:" + joinPoint.getSignature().getDeclaringTypeName());
        System.out.println("目標(biāo)方法聲明類型:" + Modifier.toString(joinPoint.getSignature().getModifiers()));
        //獲取傳入目標(biāo)方法的參數(shù)
        Object[] args = joinPoint.getArgs();
        for (int i = 0; i < args.length; i++) {
            System.out.println("第" + (i+1) + "個(gè)參數(shù)為:" + args[i]);
        }
        System.out.println("被代理的對(duì)象:" + joinPoint.getTarget());
        System.out.println("代理對(duì)象自己:" + joinPoint.getThis());
    }
    /**
     * 環(huán)繞方法,可自定義目標(biāo)方法執(zhí)行的時(shí)機(jī)
     * @param pjd JoinPoint的子接口,添加了
     *            Object proceed() throws Throwable 執(zhí)行目標(biāo)方法
     *            Object proceed(Object[] var1) throws Throwable 傳入的新的參數(shù)去執(zhí)行目標(biāo)方法
     *            兩個(gè)方法
     * @return 此方法需要返回值,返回值視為目標(biāo)方法的返回值
     */
    @Around("declareJoinPointerExpression()")
    public Object aroundMethod(ProceedingJoinPoint pjd){
        Object result = null;
        try {
            //前置通知
            System.out.println("目標(biāo)方法執(zhí)行前...");
            //執(zhí)行目標(biāo)方法
            //result = pjd.proeed();
            //用新的參數(shù)值執(zhí)行目標(biāo)方法
            result = pjd.proceed(new Object[]{"newSpring","newAop"});
            //返回通知
            System.out.println("目標(biāo)方法返回結(jié)果后...");
        } catch (Throwable e) {
            //異常通知
            System.out.println("執(zhí)行目標(biāo)方法異常后...");
            throw new RuntimeException(e);
        }
        //后置通知
        System.out.println("目標(biāo)方法執(zhí)行后...");
        return result;
    }
}

/**
 * 被代理對(duì)象
 */
@Component
public class TargetClass {
    /**
     * 拼接兩個(gè)字符串
     */
    public String joint(String str1, String str2) {
        return str1 + "+" + str2;
    }
}

public class TestAop {
    @Test
    public void testAOP() {
        //1、創(chuàng)建Spring的IOC的容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:bean.xml");
        //2、從IOC容器中獲取bean的實(shí)例
        TargetClass targetClass = (TargetClass) ctx.getBean("targetClass");
        //3、使用bean
        String result = targetClass.joint("spring","aop");
        System.out.println("result:" + result);
    }
}

String className = joinPoint.getSignature().getDeclaringTypeName();

String methodName = joinPoint.getSignature().getName();

MethodSignature methodSignature = (MethodSignature)joinPoint.getSignature();
Class clazz = methodSignature.getReturnType();

joinPoint.proceed();